One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6,8,11)(7,10,12,9)(13,14,16,18)(15,17,19,20)(5,7)(6,9)(8,12)(10,11)(13,15)(14,17)(16,19)(18,20)(21,22,26,29)(23,30,32,35)(24,28,25,33)(27,34,36,31)(5,7)(6,10)(8,12)(9,11)(14,18)(17,20)(21,23,26,32)(22,27,29,36)(24,31,25,34)(28,35,33,30)(2,4)(7,12)(9,10)(15,19)(17,20)(21,24,26,25)(22,28,29,33)(23,31,32,34)(27,35,36,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.